I was in programming class back in highschool when Manolo, Fossie and Adriana barged in to play a Peruvian song. They were dressed in traditional peruvian garments and used peruvian instruments. The teacher was mad at them, not because they interrupted the class, but because they were bad at what they were doing.
The programming teacher didn't know anything and Jaime Oropeza and another girl who where the nerds of the class didn't pay attention.